"I bought the tanking shower waterproofing kit from screw fix and ran out of the tape supplied so had to purchase some more. Not cheap stuff, there is other less well known products on screwfix but i wanted to keep all the same products.

used this in conjunction with the waterproofing solution to tape up the plasterboard joints and around the bottom of the shower tray. then two coats of the waterproofing solution over the top of the whole shower areas before tiling over.